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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Revenue recognition (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue recognition |  |  |
Inventories relating to unrecognized revenue | $ 9.0 | $ 7.1 | $ 5.9
Performance-based energy incentives recognized | 4.7 | 10.9 | 22.8
Total lease income recognized related to PPAs | $ 1.5 | $ 2.5 | $ 6.2

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- Definition Represents the amount of inventory relating to unrecognized revenue because of unsure collection of payment. + References No definition available. + Details
Name: | csiq_InventoryRelatingToNonRecognizedRevenue
Namespace Prefix: | csiq_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the performance-based energy incentives of electricity revenue recognized during the reporting period. + References No definition available. + Details
Name: | csiq_PerformanceBasedEnergyIncentivesRecognized
Namespace Prefix: | csiq_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707 + Details
Name: | us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration